2 Mountain Lion Servers: unable to create an OD replic as Mac OS X Versions are not compatible

Hi folks,

with tow Mountain Lion Servers -1 upgraded from Snow Leopard Server, 1 Upgrades from Lion Server- I cannot create the Open Directory replic to bind it to the master Open Directory. Both mac mini's are 10.8.2 with Server 2.2 (166).

I created a completely new Open Directory on Server1, when trying to create the replic on Server2 he tells me: "Your server cannot become a replic of "Server1", as the used Mac OS X Versions are not compatible."

Have you any idea, how to make this work?

Kind regards

Conrad